Download or read book R alisation de couches minces d oxynitrure de silicium par d p t chimique sous faible pression written by Guy PARAT and published by . This book was released on 1990 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pr paration de couches minces d oxynitrure de silicium par PECVD en vue de greffage chimique written by Jean-Marc Chovelon and published by . This book was released on 1991 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le premier objectif de cette thèse est de déposer sur de la silice thermique une fine couche d'oxynitrure de silicium (sio#xn#yh#z préparée par pecvd (plasma enhanced chemical vapor deposition). Cette membrane doit être à la fois sensible aux protons et facilement modifiable par greffage chimique. De plus, elle devrait être une bonne barrière de diffusion. Il est possible de contrôler le nombre de sites de surfaces (si#2nh, sinh#2, sih) en faisant varier le débit des gaz utilisés lors de dépôt (sih#4, nh#3, n#2o) et de le vérifier par spectroscopie ir. La réponse au ph de la structure si/sio#2/sio#1#,#6#4n#0#,#4#1h#0#;#4#9 a été déterminée par des mesures c(v): 60 mv/ph. Apres un greffage chimique sur les sites sinh/nh#2 de longues chaines alkyles (c18) pour rendre la membrane insensible aux protons, la réponse au ph n'est plus que de 15 mv/ph. De plus une méthode d'impédance électrochimique a été proposée permettant de suivre la qualité de l'encapsulation des isfets. Nous avons travaillé en mode potentiostatique en superposant une tension sinusoïdale à fréquence variable. Avant le disfonctionnement des isfets, trois étapes ont pu être observées.
Download or read book NITRURATION DES COUCHES MINCES D OXYDE DE SILICIUM PAR ACTIVATION THERMIQUE ET PAR STIMULATION ELECTRONIQUE written by AHMAD.. BENAMAR and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: LA NITRURATION SUPERFICIELLE DES COUCHES TRES MINCES (130 A) DE SIO#2 EST EFFECTUEE PAR DIFFERENTES TECHNIQUES (BT, HT, RTN). LA NITRURATION A BASSE PRESSION (BT OU HT) PERMET DE SITUER LA REACTION DE NITRURATION A LA SURFACE DE LA SILICE, EMPECHANT AINSI LA DIFFUSION DES ESPECES NITRURANTES. DE MEME, LA RTN EVITE LA MIGRATION DE L'AZOTE DANS LA MASSE DE LA SILICE ET LA REDISTRIBUTION DES DOPANTS. L'ANALYSE PHYSICO-CHIMIQUE (SIMS, AES, IRS, RS) A PERMIS DE METTRE EN EVIDENCE LA NITRURATION DE LA SURFACE DE LA SILICE ET DE CONTROLER LES PHENOMENES DE MIGRATION D'AZOTE A L'INTERFACE SI-SIO2 ET A REVELE LES DIFFERENTES LIAISONS CHIMIQUES (SI-N,SI-H,O-H,N-H) SUSCEPTIBLE D'ETRE A L'ORIGINE D'UN PIEGEAGE-DEPIEGEAGE DES PORTEURS. L'ANALYSE A PERMIS DE SUIVRE L'EVOLUTION DE VFB DE LA RIGIDITE DIELECTRIQUE ET DES HAUTEURS DE BARRIERE INTERFACIALES EN FONCTION DE LA NITRURATION. DIFFERENTS TYPES DE PIEGES CREES LORS DE LA NITRURATION ONT ETE DETECTES ET CARACTERISES (CONCENTRATION, SECTION EFFICACE, BARYCENTRE). LA QUALITE DE L'INTERFACE (DENSITE D'ETATS) DEPEND DES CONDITIONS ET PARAMETRES DE LA NITRURATION, DE LA QUALITE DE L'OXYDE: SI LE DESORDRE INTERFACIAL EST INITIALEMENT ELEVE, IL EST AUGMENTE APRES NITRURATION, L'AMPLITUDE DE CETTE VARIATION DEPEND DU MODE DE NITRURATION (CONTINU, SEQUENTIEL). EN RTN LA DENSITE N#I#T DIMINUE QUAND LE TEMPS DE NITRURATION AUGMENTE. GLOBALEMENT, LA NITRURATION PERMET D'AVOIR DES ISOLANTS DE BONNES QUALITES ET PEUT ETRE UN PROCEDE DE PASSIVATION EFFICACE. SI LES CONDITIONS DE NITRURATION SONT OPTIMISEES LES ISOLANTS PEUVENT DEVENIR MEILLEURS QUE LES OXYDES
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Download or read book ETUDE DU PROCEDE DE DEPOT DE COUCHES MINCES D OXYDE DE SILICIUM EN PLASMA HELICON O 2 TEOS written by FREDERIC.. NICOLAZO and published by . This book was released on 1997 with total page 247 pages. Available in PDF, EPUB and Kindle. Book excerpt: CE MEMOIRE PRESENTE L'ETUDE DU PROCEDE D'ELABORATION DE COUCHES MINCES D'OXYDE DE SILICIUM DEPOSEES A TEMPERATURE AMBIANTE EN PLASMA DE MELANGE OXYGENE/TETRAETHOXYSILANE (TEOS), DANS UN REACTEUR RADIOFREQUENCE HAUTE DENSITE, BASSE PRESSION DE TYPE HELICON. CE REACTEUR FONCTIONNE EN COUPLAGE INDUCTIF POUR LES PUISSANCES SUPERIEURES A 300 WATTS, AVEC DE FORTES DENSITES ELECTRONIQUES ET DE FAIBLES POTENTIELS. L'ETUDE DES PLASMAS D'OXYGENE PAR SPECTROMETRIE DE MASSE ET SONDE DE LANGMUIR A PERMIS DE DETERMINER L'ION MAJORITAIRE ET LES CARACTERISTIQUES ELECTRIQUES DU PLASMA. IL EST MONTRE QUE L'ACTINOMETRIE PEU ETRE UTILISEE POUR MESURER LA DENSITE D'ATOMES D'OXYGENE. ON OBTIENT DES TAUX DE DISSOCIATION DE LA MOLECULE INFERIEURS A 10%. ON EN DEDUIT UN COEFFICIENT DE RECOMBINAISON DES ATOMES D'OXYGENE SUR LES PAROIS EN ACIER DE L'ORDRE DE 0,1. LA CONNAISSANCE DE LA DENSITE DU PLASMA ET DE LA CONCENTRATION DES ATOMES D'OXYGENE EN FONCTION DE LA PUISSANCE, DE LA PRESSION ET DE LA POSITION DANS LE REACTEUR A PERMIS DE DETERMINER LES FLUX DE PARTICULES ET DE DEFINIR DES CONDITIONS FAVORABLES AU DEPOT. L'INTRODUCTION DU TEOS DANS LES PLASMAS D'OXYGENE PROVOQUE UNE DIMINUTION DE LA DENSITE ET DE LA TEMPERATURE ELECTRONIQUE. LES SPECTRES D'EMISSION OPTIQUE SONT SOIGNEUSEMENT INDEXES. LES VARIATIONS DES INTENSITES D'EMISSIONS DES ESPECES DETECTEES SONT CORRELEES A LA MODIFICATION DE LA COMPOSITION DE LA COUCHE MINCE OBTENUE. LES FILMS DEPOSES SUR SILICIUM SONT CARACTERISES PAR ABSORPTION INFRAROUGE, ELLIPSOMETRIE SPECTROSCOPIQUE ET GRAVURE CHIMIQUE LIQUIDE (P-ETCH). LES OXYDES DE SILICIUM OBTENUS DANS LES MELANGES O2/TEOS SONT DE BONNE QUALITE POUR DES TAUX DE TEOS INFERIEURS A 0,1, LORSQUE LA CINETIQUE EST LIMITEE PAR LE FLUX DE PRECURSEUR SUR LA SURFACE. POUR LES TAUX PLUS ELEVES, LA VITESSE DE DEPOT SATURE ET LES ELEMENTS CARBONES SONT OBSERVES DANS LES COUCHES.
Download or read book ZnO Thin Films written by Paolo Mele and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Zinc oxide (ZnO) is an n-type semiconductor with versatile applications such as optical devices in ultraviolet region, piezoelectric transducers, transparent electrode for solar cells and gas sensors. This book "ZnO Thin Films: Properties, Performance and Applications" gives a deep insight in the intriguing science of zinc oxide thin films. It is devoted to cover the most recent advances and reviews the state of the art of ZnO thin films applications involving energy harvesting, microelectronics, magnetic devices, photocatalysis, photovoltaics, optics, thermoelectricity, piezoelectricity, electrochemistry, temperature sensing. It serves as a fundamental information source on the techniques and methodologies involved in zinc oxide thin films growth, characterization, post-deposition plasma treatments and device processing. This book will be invaluable to the experts to consolidate their knowledge and provide insight and inspiration to beginners wishing to learn about zinc oxide thin films.
Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Download or read book Modern Surface Organometallic Chemistry written by Jean-Marie Basset and published by John Wiley & Sons. This book was released on 2009-07-10 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering everything from the basics to recent applications, this monograph represents an advanced overview of the field. Edited by internationally acclaimed experts respected throughout the community, the book is clearly divided into sections on fundamental and applied surface organometallic chemistry. Backed by numerous examples from the recent literature, this is a key reference for all chemists.
Download or read book Diffusion in Materials DIMAT 2011 written by Igor Bezverkhyy and published by Trans Tech Publications Ltd. This book was released on 2012-04-12 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: The International Conference on Diffusion in Materials (DIMAT) is the benchmark conference series for diffusion in solids. DIMAT 2011 was organized by the University of Bourgogne in association with CNRS, Dijon (France). The conference showcased new results concerning theoretical tools as well as applied research approaches. Diffusion processes affect all types of materials: nanomaterials, materials for energy, metallurgy, glasses and ceramics, but each requires its own numerical tools. Volume is indexed by Thomson Reuters CPCI-S (WoS). This volume comprises most of the contributions presented at DIMAT 2011: 4 plenary lectures delivered by famous high-level scientists plus 88 contributions in the form of keynote lectures, talks and posters.
Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
Download or read book Forest Fire Research written by Universidade de Coimbra and published by . This book was released on 2010 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt:
